1 /* 2 * Copyright (C) 2017 Netronome Systems, Inc. 3 * 4 * This software is licensed under the GNU General License Version 2, 5 * June 1991 as shown in the file COPYING in the top-level directory of this 6 * source tree. 7 * 8 * THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" 9 * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, 10 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 11 * FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE 12 * OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME 13 * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 14 */ 15 16 #include <linux/debugfs.h> 17 #include <linux/etherdevice.h> 18 #include <linux/kernel.h> 19 #include <linux/module.h> 20 #include <linux/netdevice.h> 21 #include <linux/slab.h> 22 #include <net/netdev_queues.h> 23 #include <net/page_pool/helpers.h> 24 #include <net/netlink.h> 25 #include <net/net_shaper.h> 26 #include <net/pkt_cls.h> 27 #include <net/rtnetlink.h> 28 #include <net/udp_tunnel.h> 29 30 #include "netdevsim.h" 31 32 #define NSIM_RING_SIZE 256 33 34 static int nsim_napi_rx(struct nsim_rq *rq, struct sk_buff *skb) 35 { 36 if (skb_queue_len(&rq->skb_queue) > NSIM_RING_SIZE) { 37 dev_kfree_skb_any(skb); 38 return NET_RX_DROP; 39 } 40 41 skb_queue_tail(&rq->skb_queue, skb); 42 return NET_RX_SUCCESS; 43 } 44 45 static int nsim_forward_skb(struct net_device *dev, struct sk_buff *skb, 46 struct nsim_rq *rq) 47 { 48 return __dev_forward_skb(dev, skb) ?: nsim_napi_rx(rq, skb); 49 } 50 51 static netdev_tx_t nsim_start_xmit(struct sk_buff *skb, struct net_device *dev) 52 { 53 struct netdevsim *ns = netdev_priv(dev); 54 struct net_device *peer_dev; 55 unsigned int len = skb->len; 56 struct netdevsim *peer_ns; 57 struct nsim_rq *rq; 58 int rxq; 59 60 rcu_read_lock(); 61 if (!nsim_ipsec_tx(ns, skb)) 62 goto out_drop_free; 63 64 peer_ns = rcu_dereference(ns->peer); 65 if (!peer_ns) 66 goto out_drop_free; 67 68 peer_dev = peer_ns->netdev; 69 rxq = skb_get_queue_mapping(skb); 70 if (rxq >= peer_dev->num_rx_queues) 71 rxq = rxq % peer_dev->num_rx_queues; 72 rq = peer_ns->rq[rxq]; 73 74 skb_tx_timestamp(skb); 75 if (unlikely(nsim_forward_skb(peer_dev, skb, rq) == NET_RX_DROP)) 76 goto out_drop_cnt; 77 78 napi_schedule(&rq->napi); 79 80 rcu_read_unlock(); 81 u64_stats_update_begin(&ns->syncp); 82 ns->tx_packets++; 83 ns->tx_bytes += len; 84 u64_stats_update_end(&ns->syncp); 85 return NETDEV_TX_OK; 86 87 out_drop_free: 88 dev_kfree_skb(skb); 89 out_drop_cnt: 90 rcu_read_unlock(); 91 u64_stats_update_begin(&ns->syncp); 92 ns->tx_dropped++; 93 u64_stats_update_end(&ns->syncp); 94 return NETDEV_TX_OK; 95 } 96 97 static void nsim_set_rx_mode(struct net_device *dev) 98 { 99 } 100 101 static int nsim_change_mtu(struct net_device *dev, int new_mtu) 102 { 103 struct netdevsim *ns = netdev_priv(dev); 104 105 if (ns->xdp.prog && new_mtu > NSIM_XDP_MAX_MTU) 106 return -EBUSY; 107 108 WRITE_ONCE(dev->mtu, new_mtu); 109 110 return 0; 111 } 112 113 static void 114 nsim_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) 115 { 116 struct netdevsim *ns = netdev_priv(dev); 117 unsigned int start; 118 119 do { 120 start = u64_stats_fetch_begin(&ns->syncp); 121 stats->tx_bytes = ns->tx_bytes; 122 stats->tx_packets = ns->tx_packets; 123 stats->tx_dropped = ns->tx_dropped; 124 } while (u64_stats_fetch_retry(&ns->syncp, start)); 125 } 126 127 static int 128 nsim_setup_tc_block_cb(enum tc_setup_type type, void *type_data, void *cb_priv) 129 { 130 return nsim_bpf_setup_tc_block_cb(type, type_data, cb_priv); 131 } 132 133 static int nsim_set_vf_mac(struct net_device *dev, int vf, u8 *mac) 134 { 135 struct netdevsim *ns = netdev_priv(dev); 136 struct nsim_dev *nsim_dev = ns->nsim_dev; 137 138 /* Only refuse multicast addresses, zero address can mean unset/any. */ 139 if (vf >= nsim_dev_get_vfs(nsim_dev) || is_multicast_ether_addr(mac)) 140 return -EINVAL; 141 memcpy(nsim_dev->vfconfigs[vf].vf_mac, mac, ETH_ALEN); 142 143 return 0; 144 } 145 146 static int nsim_set_vf_vlan(struct net_device *dev, int vf, 147 u16 vlan, u8 qos, __be16 vlan_proto) 148 { 149 struct netdevsim *ns = netdev_priv(dev); 150 struct nsim_dev *nsim_dev = ns->nsim_dev; 151 152 if (vf >= nsim_dev_get_vfs(nsim_dev) || vlan > 4095 || qos > 7) 153 return -EINVAL; 154 155 nsim_dev->vfconfigs[vf].vlan = vlan; 156 nsim_dev->vfconfigs[vf].qos = qos; 157 nsim_dev->vfconfigs[vf].vlan_proto = vlan_proto; 158 159 return 0; 160 } 161 162 static int nsim_set_vf_rate(struct net_device *dev, int vf, int min, int max) 163 { 164 struct netdevsim *ns = netdev_priv(dev); 165 struct nsim_dev *nsim_dev = ns->nsim_dev; 166 167 if (nsim_esw_mode_is_switchdev(ns->nsim_dev)) { 168 pr_err("Not supported in switchdev mode. Please use devlink API.\n"); 169 return -EOPNOTSUPP; 170 } 171 172 if (vf >= nsim_dev_get_vfs(nsim_dev)) 173 return -EINVAL; 174 175 nsim_dev->vfconfigs[vf].min_tx_rate = min; 176 nsim_dev->vfconfigs[vf].max_tx_rate = max; 177 178 return 0; 179 } 180 181 static int nsim_set_vf_spoofchk(struct net_device *dev, int vf, bool val) 182 { 183 struct netdevsim *ns = netdev_priv(dev); 184 struct nsim_dev *nsim_dev = ns->nsim_dev; 185 186 if (vf >= nsim_dev_get_vfs(nsim_dev)) 187 return -EINVAL; 188 nsim_dev->vfconfigs[vf].spoofchk_enabled = val; 189 190 return 0; 191 } 192 193 static int nsim_set_vf_rss_query_en(struct net_device *dev, int vf, bool val) 194 { 195 struct netdevsim *ns = netdev_priv(dev); 196 struct nsim_dev *nsim_dev = ns->nsim_dev; 197 198 if (vf >= nsim_dev_get_vfs(nsim_dev)) 199 return -EINVAL; 200 nsim_dev->vfconfigs[vf].rss_query_enabled = val; 201 202 return 0; 203 } 204 205 static int nsim_set_vf_trust(struct net_device *dev, int vf, bool val) 206 { 207 struct netdevsim *ns = netdev_priv(dev); 208 struct nsim_dev *nsim_dev = ns->nsim_dev; 209 210 if (vf >= nsim_dev_get_vfs(nsim_dev)) 211 return -EINVAL; 212 nsim_dev->vfconfigs[vf].trusted = val; 213 214 return 0; 215 } 216 217 static int 218 nsim_get_vf_config(struct net_device *dev, int vf, struct ifla_vf_info *ivi) 219 { 220 struct netdevsim *ns = netdev_priv(dev); 221 struct nsim_dev *nsim_dev = ns->nsim_dev; 222 223 if (vf >= nsim_dev_get_vfs(nsim_dev)) 224 return -EINVAL; 225 226 ivi->vf = vf; 227 ivi->linkstate = nsim_dev->vfconfigs[vf].link_state; 228 ivi->min_tx_rate = nsim_dev->vfconfigs[vf].min_tx_rate; 229 ivi->max_tx_rate = nsim_dev->vfconfigs[vf].max_tx_rate; 230 ivi->vlan = nsim_dev->vfconfigs[vf].vlan; 231 ivi->vlan_proto = nsim_dev->vfconfigs[vf].vlan_proto; 232 ivi->qos = nsim_dev->vfconfigs[vf].qos; 233 memcpy(&ivi->mac, nsim_dev->vfconfigs[vf].vf_mac, ETH_ALEN); 234 ivi->spoofchk = nsim_dev->vfconfigs[vf].spoofchk_enabled; 235 ivi->trusted = nsim_dev->vfconfigs[vf].trusted; 236 ivi->rss_query_en = nsim_dev->vfconfigs[vf].rss_query_enabled; 237 238 return 0; 239 } 240 241 static int nsim_set_vf_link_state(struct net_device *dev, int vf, int state) 242 { 243 struct netdevsim *ns = netdev_priv(dev); 244 struct nsim_dev *nsim_dev = ns->nsim_dev; 245 246 if (vf >= nsim_dev_get_vfs(nsim_dev)) 247 return -EINVAL; 248 249 switch (state) { 250 case IFLA_VF_LINK_STATE_AUTO: 251 case IFLA_VF_LINK_STATE_ENABLE: 252 case IFLA_VF_LINK_STATE_DISABLE: 253 break; 254 default: 255 return -EINVAL; 256 } 257 258 nsim_dev->vfconfigs[vf].link_state = state; 259 260 return 0; 261 } 262 263 static void nsim_taprio_stats(struct tc_taprio_qopt_stats *stats) 264 { 265 stats->window_drops = 0; 266 stats->tx_overruns = 0; 267 } 268 269 static int nsim_setup_tc_taprio(struct net_device *dev, 270 struct tc_taprio_qopt_offload *offload) 271 { 272 int err = 0; 273 274 switch (offload->cmd) { 275 case TAPRIO_CMD_REPLACE: 276 case TAPRIO_CMD_DESTROY: 277 break; 278 case TAPRIO_CMD_STATS: 279 nsim_taprio_stats(&offload->stats); 280 break; 281 default: 282 err = -EOPNOTSUPP; 283 } 284 285 return err; 286 } 287 288 static LIST_HEAD(nsim_block_cb_list); 289 290 static int 291 nsim_setup_tc(struct net_device *dev, enum tc_setup_type type, void *type_data) 292 { 293 struct netdevsim *ns = netdev_priv(dev); 294 295 switch (type) { 296 case TC_SETUP_QDISC_TAPRIO: 297 return nsim_setup_tc_taprio(dev, type_data); 298 case TC_SETUP_BLOCK: 299 return flow_block_cb_setup_simple(type_data, 300 &nsim_block_cb_list, 301 nsim_setup_tc_block_cb, 302 ns, ns, true); 303 default: 304 return -EOPNOTSUPP; 305 } 306 } 307 308 static int 309 nsim_set_features(struct net_device *dev, netdev_features_t features) 310 { 311 struct netdevsim *ns = netdev_priv(dev); 312 313 if ((dev->features & NETIF_F_HW_TC) > (features & NETIF_F_HW_TC)) 314 return nsim_bpf_disable_tc(ns); 315 316 return 0; 317 } 318 319 static int nsim_get_iflink(const struct net_device *dev) 320 { 321 struct netdevsim *nsim, *peer; 322 int iflink; 323 324 nsim = netdev_priv(dev); 325 326 rcu_read_lock(); 327 peer = rcu_dereference(nsim->peer); 328 iflink = peer ? READ_ONCE(peer->netdev->ifindex) : 329 READ_ONCE(dev->ifindex); 330 rcu_read_unlock(); 331 332 return iflink; 333 } 334 335 static int nsim_rcv(struct nsim_rq *rq, int budget) 336 { 337 struct sk_buff *skb; 338 int i; 339 340 for (i = 0; i < budget; i++) { 341 if (skb_queue_empty(&rq->skb_queue)) 342 break; 343 344 skb = skb_dequeue(&rq->skb_queue); 345 netif_receive_skb(skb); 346 } 347 348 return i; 349 } 350 351 static int nsim_poll(struct napi_struct *napi, int budget) 352 { 353 struct nsim_rq *rq = container_of(napi, struct nsim_rq, napi); 354 int done; 355 356 done = nsim_rcv(rq, budget); 357 napi_complete(napi); 358 359 return done; 360 } 361 362 static int nsim_create_page_pool(struct nsim_rq *rq) 363 { 364 struct page_pool_params p = { 365 .order = 0, 366 .pool_size = NSIM_RING_SIZE, 367 .nid = NUMA_NO_NODE, 368 .dev = &rq->napi.dev->dev, 369 .napi = &rq->napi, 370 .dma_dir = DMA_BIDIRECTIONAL, 371 .netdev = rq->napi.dev, 372 }; 373 374 rq->page_pool = page_pool_create(&p); 375 if (IS_ERR(rq->page_pool)) { 376 int err = PTR_ERR(rq->page_pool); 377 378 rq->page_pool = NULL; 379 return err; 380 } 381 return 0; 382 } 383 384 static int nsim_init_napi(struct netdevsim *ns) 385 { 386 struct net_device *dev = ns->netdev; 387 struct nsim_rq *rq; 388 int err, i; 389 390 for (i = 0; i < dev->num_rx_queues; i++) { 391 rq = ns->rq[i]; 392 393 netif_napi_add_config(dev, &rq->napi, nsim_poll, i); 394 } 395 396 for (i = 0; i < dev->num_rx_queues; i++) { 397 rq = ns->rq[i]; 398 399 err = nsim_create_page_pool(rq); 400 if (err) 401 goto err_pp_destroy; 402 } 403 404 return 0; 405 406 err_pp_destroy: 407 while (i--) { 408 page_pool_destroy(ns->rq[i]->page_pool); 409 ns->rq[i]->page_pool = NULL; 410 } 411 412 for (i = 0; i < dev->num_rx_queues; i++) 413 __netif_napi_del(&ns->rq[i]->napi); 414 415 return err; 416 } 417 418 static void nsim_enable_napi(struct netdevsim *ns) 419 { 420 struct net_device *dev = ns->netdev; 421 int i; 422 423 for (i = 0; i < dev->num_rx_queues; i++) { 424 struct nsim_rq *rq = ns->rq[i]; 425 426 netif_queue_set_napi(dev, i, NETDEV_QUEUE_TYPE_RX, &rq->napi); 427 napi_enable(&rq->napi); 428 } 429 } 430 431 static int nsim_open(struct net_device *dev) 432 { 433 struct netdevsim *ns = netdev_priv(dev); 434 int err; 435 436 err = nsim_init_napi(ns); 437 if (err) 438 return err; 439 440 nsim_enable_napi(ns); 441 442 return 0; 443 } 444 445 static void nsim_del_napi(struct netdevsim *ns) 446 { 447 struct net_device *dev = ns->netdev; 448 int i; 449 450 for (i = 0; i < dev->num_rx_queues; i++) { 451 struct nsim_rq *rq = ns->rq[i]; 452 453 napi_disable(&rq->napi); 454 __netif_napi_del(&rq->napi); 455 } 456 synchronize_net(); 457 458 for (i = 0; i < dev->num_rx_queues; i++) { 459 page_pool_destroy(ns->rq[i]->page_pool); 460 ns->rq[i]->page_pool = NULL; 461 } 462 } 463 464 static int nsim_stop(struct net_device *dev) 465 { 466 struct netdevsim *ns = netdev_priv(dev); 467 struct netdevsim *peer; 468 469 netif_carrier_off(dev); 470 peer = rtnl_dereference(ns->peer); 471 if (peer) 472 netif_carrier_off(peer->netdev); 473 474 nsim_del_napi(ns); 475 476 return 0; 477 } 478 479 static int nsim_shaper_set(struct net_shaper_binding *binding, 480 const struct net_shaper *shaper, 481 struct netlink_ext_ack *extack) 482 { 483 return 0; 484 } 485 486 static int nsim_shaper_del(struct net_shaper_binding *binding, 487 const struct net_shaper_handle *handle, 488 struct netlink_ext_ack *extack) 489 { 490 return 0; 491 } 492 493 static int nsim_shaper_group(struct net_shaper_binding *binding, 494 int leaves_count, 495 const struct net_shaper *leaves, 496 const struct net_shaper *root, 497 struct netlink_ext_ack *extack) 498 { 499 return 0; 500 } 501 502 static void nsim_shaper_cap(struct net_shaper_binding *binding, 503 enum net_shaper_scope scope, 504 unsigned long *flags) 505 { 506 *flags = ULONG_MAX; 507 } 508 509 static const struct net_shaper_ops nsim_shaper_ops = { 510 .set = nsim_shaper_set, 511 .delete = nsim_shaper_del, 512 .group = nsim_shaper_group, 513 .capabilities = nsim_shaper_cap, 514 }; 515 516 static const struct net_device_ops nsim_netdev_ops = { 517 .ndo_start_xmit = nsim_start_xmit, 518 .ndo_set_rx_mode = nsim_set_rx_mode, 519 .ndo_set_mac_address = eth_mac_addr, 520 .ndo_validate_addr = eth_validate_addr, 521 .ndo_change_mtu = nsim_change_mtu, 522 .ndo_get_stats64 = nsim_get_stats64, 523 .ndo_set_vf_mac = nsim_set_vf_mac, 524 .ndo_set_vf_vlan = nsim_set_vf_vlan, 525 .ndo_set_vf_rate = nsim_set_vf_rate, 526 .ndo_set_vf_spoofchk = nsim_set_vf_spoofchk, 527 .ndo_set_vf_trust = nsim_set_vf_trust, 528 .ndo_get_vf_config = nsim_get_vf_config, 529 .ndo_set_vf_link_state = nsim_set_vf_link_state, 530 .ndo_set_vf_rss_query_en = nsim_set_vf_rss_query_en, 531 .ndo_setup_tc = nsim_setup_tc, 532 .ndo_set_features = nsim_set_features, 533 .ndo_get_iflink = nsim_get_iflink, 534 .ndo_bpf = nsim_bpf, 535 .ndo_open = nsim_open, 536 .ndo_stop = nsim_stop, 537 .net_shaper_ops = &nsim_shaper_ops, 538 }; 539 540 static const struct net_device_ops nsim_vf_netdev_ops = { 541 .ndo_start_xmit = nsim_start_xmit, 542 .ndo_set_rx_mode = nsim_set_rx_mode, 543 .ndo_set_mac_address = eth_mac_addr, 544 .ndo_validate_addr = eth_validate_addr, 545 .ndo_change_mtu = nsim_change_mtu, 546 .ndo_get_stats64 = nsim_get_stats64, 547 .ndo_setup_tc = nsim_setup_tc, 548 .ndo_set_features = nsim_set_features, 549 }; 550 551 /* We don't have true per-queue stats, yet, so do some random fakery here. 552 * Only report stuff for queue 0. 553 */ 554 static void nsim_get_queue_stats_rx(struct net_device *dev, int idx, 555 struct netdev_queue_stats_rx *stats) 556 { 557 struct rtnl_link_stats64 rtstats = {}; 558 559 if (!idx) 560 nsim_get_stats64(dev, &rtstats); 561 562 stats->packets = rtstats.rx_packets - !!rtstats.rx_packets; 563 stats->bytes = rtstats.rx_bytes; 564 } 565 566 static void nsim_get_queue_stats_tx(struct net_device *dev, int idx, 567 struct netdev_queue_stats_tx *stats) 568 { 569 struct rtnl_link_stats64 rtstats = {}; 570 571 if (!idx) 572 nsim_get_stats64(dev, &rtstats); 573 574 stats->packets = rtstats.tx_packets - !!rtstats.tx_packets; 575 stats->bytes = rtstats.tx_bytes; 576 } 577 578 static void nsim_get_base_stats(struct net_device *dev, 579 struct netdev_queue_stats_rx *rx, 580 struct netdev_queue_stats_tx *tx) 581 { 582 struct rtnl_link_stats64 rtstats = {}; 583 584 nsim_get_stats64(dev, &rtstats); 585 586 rx->packets = !!rtstats.rx_packets; 587 rx->bytes = 0; 588 tx->packets = !!rtstats.tx_packets; 589 tx->bytes = 0; 590 } 591 592 static const struct netdev_stat_ops nsim_stat_ops = { 593 .get_queue_stats_tx = nsim_get_queue_stats_tx, 594 .get_queue_stats_rx = nsim_get_queue_stats_rx, 595 .get_base_stats = nsim_get_base_stats, 596 }; 597 598 static struct nsim_rq *nsim_queue_alloc(void) 599 { 600 struct nsim_rq *rq; 601 602 rq = kzalloc(sizeof(*rq), GFP_KERNEL_ACCOUNT); 603 if (!rq) 604 return NULL; 605 606 skb_queue_head_init(&rq->skb_queue); 607 return rq; 608 } 609 610 static void nsim_queue_free(struct nsim_rq *rq) 611 { 612 skb_queue_purge_reason(&rq->skb_queue, SKB_DROP_REASON_QUEUE_PURGE); 613 kfree(rq); 614 } 615 616 static ssize_t 617 nsim_pp_hold_read(struct file *file, char __user *data, 618 size_t count, loff_t *ppos) 619 { 620 struct netdevsim *ns = file->private_data; 621 char buf[3] = "n\n"; 622 623 if (ns->page) 624 buf[0] = 'y'; 625 626 return simple_read_from_buffer(data, count, ppos, buf, 2); 627 } 628 629 static ssize_t 630 nsim_pp_hold_write(struct file *file, const char __user *data, 631 size_t count, loff_t *ppos) 632 { 633 struct netdevsim *ns = file->private_data; 634 ssize_t ret; 635 bool val; 636 637 ret = kstrtobool_from_user(data, count, &val); 638 if (ret) 639 return ret; 640 641 rtnl_lock(); 642 ret = count; 643 if (val == !!ns->page) 644 goto exit; 645 646 if (!netif_running(ns->netdev) && val) { 647 ret = -ENETDOWN; 648 } else if (val) { 649 ns->page = page_pool_dev_alloc_pages(ns->rq[0]->page_pool); 650 if (!ns->page) 651 ret = -ENOMEM; 652 } else { 653 page_pool_put_full_page(ns->page->pp, ns->page, false); 654 ns->page = NULL; 655 } 656 657 exit: 658 rtnl_unlock(); 659 return ret; 660 } 661 662 static const struct file_operations nsim_pp_hold_fops = { 663 .open = simple_open, 664 .read = nsim_pp_hold_read, 665 .write = nsim_pp_hold_write, 666 .llseek = generic_file_llseek, 667 .owner = THIS_MODULE, 668 }; 669 670 static void nsim_setup(struct net_device *dev) 671 { 672 ether_setup(dev); 673 eth_hw_addr_random(dev); 674 675 dev->tx_queue_len = 0; 676 dev->flags &= ~IFF_MULTICAST; 677 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | 678 IFF_NO_QUEUE; 679 dev->features |= NETIF_F_HIGHDMA | 680 NETIF_F_SG | 681 NETIF_F_FRAGLIST | 682 NETIF_F_HW_CSUM | 683 NETIF_F_TSO; 684 dev->hw_features |= NETIF_F_HW_TC | 685 NETIF_F_SG | 686 NETIF_F_FRAGLIST | 687 NETIF_F_HW_CSUM | 688 NETIF_F_TSO; 689 dev->max_mtu = ETH_MAX_MTU; 690 dev->xdp_features = NETDEV_XDP_ACT_HW_OFFLOAD; 691 } 692 693 static int nsim_queue_init(struct netdevsim *ns) 694 { 695 struct net_device *dev = ns->netdev; 696 int i; 697 698 ns->rq = kcalloc(dev->num_rx_queues, sizeof(*ns->rq), 699 GFP_KERNEL_ACCOUNT); 700 if (!ns->rq) 701 return -ENOMEM; 702 703 for (i = 0; i < dev->num_rx_queues; i++) { 704 ns->rq[i] = nsim_queue_alloc(); 705 if (!ns->rq[i]) 706 goto err_free_prev; 707 } 708 709 return 0; 710 711 err_free_prev: 712 while (i--) 713 kfree(ns->rq[i]); 714 kfree(ns->rq); 715 return -ENOMEM; 716 } 717 718 static void nsim_queue_uninit(struct netdevsim *ns) 719 { 720 struct net_device *dev = ns->netdev; 721 int i; 722 723 for (i = 0; i < dev->num_rx_queues; i++) 724 nsim_queue_free(ns->rq[i]); 725 726 kfree(ns->rq); 727 ns->rq = NULL; 728 } 729 730 static int nsim_init_netdevsim(struct netdevsim *ns) 731 { 732 struct mock_phc *phc; 733 int err; 734 735 phc = mock_phc_create(&ns->nsim_bus_dev->dev); 736 if (IS_ERR(phc)) 737 return PTR_ERR(phc); 738 739 ns->phc = phc; 740 ns->netdev->netdev_ops = &nsim_netdev_ops; 741 ns->netdev->stat_ops = &nsim_stat_ops; 742 743 err = nsim_udp_tunnels_info_create(ns->nsim_dev, ns->netdev); 744 if (err) 745 goto err_phc_destroy; 746 747 rtnl_lock(); 748 err = nsim_queue_init(ns); 749 if (err) 750 goto err_utn_destroy; 751 752 err = nsim_bpf_init(ns); 753 if (err) 754 goto err_rq_destroy; 755 756 nsim_macsec_init(ns); 757 nsim_ipsec_init(ns); 758 759 err = register_netdevice(ns->netdev); 760 if (err) 761 goto err_ipsec_teardown; 762 rtnl_unlock(); 763 return 0; 764 765 err_ipsec_teardown: 766 nsim_ipsec_teardown(ns); 767 nsim_macsec_teardown(ns); 768 nsim_bpf_uninit(ns); 769 err_rq_destroy: 770 nsim_queue_uninit(ns); 771 err_utn_destroy: 772 rtnl_unlock(); 773 nsim_udp_tunnels_info_destroy(ns->netdev); 774 err_phc_destroy: 775 mock_phc_destroy(ns->phc); 776 return err; 777 } 778 779 static int nsim_init_netdevsim_vf(struct netdevsim *ns) 780 { 781 int err; 782 783 ns->netdev->netdev_ops = &nsim_vf_netdev_ops; 784 rtnl_lock(); 785 err = register_netdevice(ns->netdev); 786 rtnl_unlock(); 787 return err; 788 } 789 790 static void nsim_exit_netdevsim(struct netdevsim *ns) 791 { 792 nsim_udp_tunnels_info_destroy(ns->netdev); 793 mock_phc_destroy(ns->phc); 794 } 795 796 struct netdevsim * 797 nsim_create(struct nsim_dev *nsim_dev, struct nsim_dev_port *nsim_dev_port) 798 { 799 struct net_device *dev; 800 struct netdevsim *ns; 801 int err; 802 803 dev = alloc_netdev_mq(sizeof(*ns), "eth%d", NET_NAME_UNKNOWN, nsim_setup, 804 nsim_dev->nsim_bus_dev->num_queues); 805 if (!dev) 806 return ERR_PTR(-ENOMEM); 807 808 dev_net_set(dev, nsim_dev_net(nsim_dev)); 809 ns = netdev_priv(dev); 810 ns->netdev = dev; 811 u64_stats_init(&ns->syncp); 812 ns->nsim_dev = nsim_dev; 813 ns->nsim_dev_port = nsim_dev_port; 814 ns->nsim_bus_dev = nsim_dev->nsim_bus_dev; 815 SET_NETDEV_DEV(dev, &ns->nsim_bus_dev->dev); 816 SET_NETDEV_DEVLINK_PORT(dev, &nsim_dev_port->devlink_port); 817 nsim_ethtool_init(ns); 818 if (nsim_dev_port_is_pf(nsim_dev_port)) 819 err = nsim_init_netdevsim(ns); 820 else 821 err = nsim_init_netdevsim_vf(ns); 822 if (err) 823 goto err_free_netdev; 824 825 ns->pp_dfs = debugfs_create_file("pp_hold", 0600, nsim_dev_port->ddir, 826 ns, &nsim_pp_hold_fops); 827 828 return ns; 829 830 err_free_netdev: 831 free_netdev(dev); 832 return ERR_PTR(err); 833 } 834 835 void nsim_destroy(struct netdevsim *ns) 836 { 837 struct net_device *dev = ns->netdev; 838 struct netdevsim *peer; 839 840 debugfs_remove(ns->pp_dfs); 841 842 rtnl_lock(); 843 peer = rtnl_dereference(ns->peer); 844 if (peer) 845 RCU_INIT_POINTER(peer->peer, NULL); 846 RCU_INIT_POINTER(ns->peer, NULL); 847 unregister_netdevice(dev); 848 if (nsim_dev_port_is_pf(ns->nsim_dev_port)) { 849 nsim_macsec_teardown(ns); 850 nsim_ipsec_teardown(ns); 851 nsim_bpf_uninit(ns); 852 nsim_queue_uninit(ns); 853 } 854 rtnl_unlock(); 855 if (nsim_dev_port_is_pf(ns->nsim_dev_port)) 856 nsim_exit_netdevsim(ns); 857 858 /* Put this intentionally late to exercise the orphaning path */ 859 if (ns->page) { 860 page_pool_put_full_page(ns->page->pp, ns->page, false); 861 ns->page = NULL; 862 } 863 864 free_netdev(dev); 865 } 866 867 bool netdev_is_nsim(struct net_device *dev) 868 { 869 return dev->netdev_ops == &nsim_netdev_ops; 870 } 871 872 static int nsim_validate(struct nlattr *tb[], struct nlattr *data[], 873 struct netlink_ext_ack *extack) 874 { 875 NL_SET_ERR_MSG_MOD(extack, 876 "Please use: echo \"[ID] [PORT_COUNT] [NUM_QUEUES]\" > /sys/bus/netdevsim/new_device"); 877 return -EOPNOTSUPP; 878 } 879 880 static struct rtnl_link_ops nsim_link_ops __read_mostly = { 881 .kind = DRV_NAME, 882 .validate = nsim_validate, 883 }; 884 885 static int __init nsim_module_init(void) 886 { 887 int err; 888 889 err = nsim_dev_init(); 890 if (err) 891 return err; 892 893 err = nsim_bus_init(); 894 if (err) 895 goto err_dev_exit; 896 897 err = rtnl_link_register(&nsim_link_ops); 898 if (err) 899 goto err_bus_exit; 900 901 return 0; 902 903 err_bus_exit: 904 nsim_bus_exit(); 905 err_dev_exit: 906 nsim_dev_exit(); 907 return err; 908 } 909 910 static void __exit nsim_module_exit(void) 911 { 912 rtnl_link_unregister(&nsim_link_ops); 913 nsim_bus_exit(); 914 nsim_dev_exit(); 915 } 916 917 module_init(nsim_module_init); 918 module_exit(nsim_module_exit); 919 MODULE_LICENSE("GPL"); 920 MODULE_DESCRIPTION("Simulated networking device for testing"); 921 MODULE_ALIAS_RTNL_LINK(DRV_NAME); 922